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Note 11 - Fair Value Measurements (Details Textual) - USD ($) | Jun. 27, 2021 | Sep. 27, 2020 | Mar. 31, 2014
--- | --- | --- | ---
Warrants and Rights Outstanding | $ 1,317,000 | $ 363,000 |
Senior Secured Notes [Member] |  |  |
Debt Instrument, Face Amount | 485,162,000 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |
Investments, Fair Value Disclosure, Total | $ 4,226,000 |  |
Fair Value, Inputs, Level 3 [Member] | TCT and Private Equity Investment [Member] |  |  |
Equity Securities without Readily Determinable Fair Value, Percent | 17.00% |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Warrants and Rights Outstanding |  |  | $ 16,930,000

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